A method of cleaning a waste water vessel 100 for the waste water industry comprises adding a first quantity of a first reagent to the waste water vessel, adding a second quantity of a second reagent to the waste water vessel, the first and second reagents being reagents that react together in an exothermic reaction whose products comprise sodium chloride and nitrogen. Heat generated from the exothermic reaction causes solidified fat, oil and/or grease (FOG) deposits 105 in the waste water vessel to melt. Preferably, the first and second reagents are sodium nitrite and ammonium chloride respectively. An activator, such as acetic acid, may be added to the waste water vessel, wherein the quantity of activator is selected in order to control a temperature the solidified FOG deposits are raised to by the exothermic reaction. The method may also comprise adding a quantity of surfactant and/or inhibitor to the vessel. The vessel can comprise a settling tank in a waste water treatment plant or a section of waste water pipes within a sewage system.

专利号	专利名称	专利权人	优先权号
GB2505244A	Cleaning a waste water vessel using an exothermic reaction	GREEN CHANNEL LTD;	GB20120015154

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